Characteristics of copper-resistant bacteria in a copper-contaminated rhizoshere soil
2001
Saeki, K. (Oita Univ. (Japan)) | Kunito, T. | Nagaoka, K. | Oyaidzu, H. | Matsumoto, S.
Characteristics of copper (Cu) -resistant bacterial communities in a rhizosphere and non-rhizosphere of a ditch reed, Phmgmites sp., in highly Cu-contaminated area near a copper mine were investigated. In the rhizosphere, multiplication of bacteria, particularly non-resistant bacteria, was promoted as compared with the nonrhizosphere. The properties of bacterial community in the rhizosphere were largely different from those in the non-rhizosphere in Cu sorption. growth rate, and exopolymers production. Both Cu-resistant bacteria and non-resistant bacteria in the rhizosphere grew more rapidly in a medium than those in the non-rhizosphere. For almost all the isolates with Cu resistance, exopolymer productions were prompted by Cu stimuli expecially for the Cu-resistant bacteria from the rhizosphere. The adverse effect of Cu on the growth rate, was found to be small for the Cu-resistant bacteria producing exopolymers in large quantity, suggesting the involvement of exopolymers in detoxification of Cu.
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